The Linear MCS306010 is a 1-Channel Key Ring Transmitter is a miniature keyfob style transmitter designed for automatic door and gate operator applications.

This transmitter is a single-channel device, pressing the pushbutton will send a signal to the receiver. The transmitter has a red test/operate indicator and is powered by a 12-volt battery. A molded-in hole in the case is pefect for attaching the transmitter to a key ring.